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TROUBLESHOOTING
Thermostat, Check
With the thermostat removed from the engine,
check its operation as follows:
1. Check to be sure that the thermostat closes
fully. This can be done by holding it up to the
light to verify that there is no visible gap at
the opening point. If the thermostat does not
close properly, replace it.
2. Add water to a suitable container and warm
the water to 75°C (167°F). With the water
warmed, immerse the thermostat in the
water. Use a piece of wire attached to the
thermostat.
75
Figure 75 — Thermostat Closed
3. After at least 30 seconds, check that the
thermostat is still closed.
4. Now warm the water to 100°C (212°F). After
at least 30 seconds at the boiling point,
check that the thermostat has opened
approximately 16 mm (0.63 inch). If the
thermostat has not opened, it must be
replaced. A good thermostat starts to close
at approximately 92°C (198°F) and is fully
closed at approximately 82°C (180°F).
76
Figure 76 — Thermostat Open
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